Ultrasonic motor mechanism

Abstract

A linear drive ultrasonic motor includes at least an ultrasonic vibrator having a piezoelectric element, a driven member which is driven relatively by a frictional force between the ultrasonic vibrator and the driven member, a plurality of coupling members which are coupled with the driven member, a frame body which is coupled with the coupling member, a bias applying member which applies a bias to the driven member by the ultrasonic vibrator, a base member which movably supports the driven member, and a rolling member having a spherical shape which movably supports the driven member with respect to the base member. The plurality of coupling members include a positioning portion which determines a position of the respective frame body, and which have a shape which enables to fix by a point contact, sandwiching the frame body.

1. An ultrasonic motor mechanism comprising:
 an ultrasonic vibrator having a piezoelectric element; 
 a driven member which is driven relatively by a frictional force between the ultrasonic vibrator and the driven member; 
 a plurality of coupling members which are coupled with the driven member; 
 a frame body which is coupled with the coupling member; 
 a bias applying member which applies a bias to the driven member by the ultrasonic vibrator; 
 a base member which movably supports the driven member; and 
 a rolling member having a spherical shape, which movably supports the driven member with respect to the base member, 
 wherein the plurality of coupling members include a positioning portion which determines a position of the respective frame body, and which have a shape which enables to fix by a point contact, sandwiching the frame body. 
 
     
     
       2. The ultrasonic motor mechanism according to  claim 1 , wherein, a direction in which, the coupling member sandwiches the frame body is one of a direction at right angles to a direction in which the bias is applied, and a direction parallel to a direction in which the bias is applied. 
     
     
       3. The ultrasonic motor mechanism according to  claim 2 , wherein the positioning portion of the coupling member has one of a shape of a V-groove, a semicircular concave shape, and a convex shape. 
     
     
       4. The ultrasonic motor mechanism according to  claim 3 , wherein the frame body has one of a convex shape and a concave shape corresponding to the positioning portion of the coupling member. 
     
     
       5. The ultrasonic motor mechanism according to  claim 4 , wherein the coupling member and the driven member are fixed mutually near anode of bending vibration of the driven member, and in a direction at right angles to the bending vibration of the driven member or a direction parallel to the bending vibration of the driven member. 
     
     
       6. The ultrasonic motor mechanism according to  claim 1 , wherein the positioning portion of the coupling member has one of a shape of a V-groove, a semicircular concave shape, and a convex shape. 
     
     
       7. The ultrasonic motor mechanism according to  claim 1 , wherein the frame body has one of a convex shape and a concave shape corresponding to the positioning portion. 
     
     
       8. The ultrasonic motor mechanism according to  claim 1 , wherein the coupling member and the driven member are fixed mutually near a node of bending vibration of the driven member, and in a direction at right angles to the bending vibration of the driven member or a direction parallel to the bending vibration of the driven member.